I've always had better luck with P96 as well.
That's been my experience all these years as well. Can't think of a single time where a CGFX install ever went right on legacy hardware for me. When I first heard that was the video driver employed in MorphOS, I thought "oh shit", but all seems to be fine in that environment. Well, gotta have a compatible monitor upon first install (ie: old CRT) or force your hardware to display "compatible" mode before you can go ahead and tweak for use of something more modern that is.
